Compare 21/72 and 20/70
21/72 is greater than 20/70
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 70 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 72 × 35 = 2520,
21/72 = 21 × 35/72 × 35 = 735/2520 - Likewise, for the 2nd fraction, since 70 × 36 = 2520,
20/70 = 20 × 36/70 × 36 = 720/2520 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 735/2520 > 720/2520 or 21/72 > 20/70
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